created new Skills obj

jsprit-core/src/main/java/jsprit/core/problem/Skills.java

@@ -0,0 +1,76 @@
+package jsprit.core.problem;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Created by schroeder on 01.07.14.
+ */
+public class Skills {
+
+    public static class Builder {
+
+        /**
+         * Returns new instance of skill-builder.
+         *
+         * @return
+         */
+        public static Builder newInstance(){
+            return new Builder();
+        }
+
+        private Set<String> skills = new HashSet<String>();
+
+        /**
+         * Adds skill. Skill is transformed into lowerCase.
+         *
+         * @param skill
+         * @return
+         */
+        public Builder addSkill(String skill){
+            skills.add(skill.toLowerCase());
+            return this;
+        }
+
+        public Builder addAllSkills(Collection<String> skills){
+            for(String skill : skills) this.skills.add(skill);
+            return this;
+        }
+
+        public Skills build(){
+            return new Skills(this);
+        }
+
+    }
+
+    private Set<String> skills = new HashSet<String>();
+
+    private Skills(Builder builder){
+        skills.addAll(builder.skills);
+    }
+
+    /**
+     * Returns an unmodifiable set of skills. All skills are inLowerCase.
+     *
+     * @return
+     */
+    public Set<String> values(){
+        return Collections.unmodifiableSet(skills);
+    }
+
+    /**
+     * Not case sensitive.
+     *
+     * @param skill
+     * @return
+     */
+    public boolean containsSkill(String skill){
+        return skills.contains(skill.toLowerCase());
+    }
+
+
+
+
+}